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Q. Common causes related with angina pectoris?
• The usual cause of angina is the narrowing of the major coronary artery due to atherosclerosis.
• Systemic hypertension increases myocardial demand and if the supply of blood to the heart muscles is less, it can cause angina.
• Heart disease: In late stages of aortic stenosis (narrowing of aorta) it can precipitate an anginal attack.
• Anaemia: The heart gets less oxygen due to lack of haemoglobin in anaemia.
SOM E COMMON REFLEXES RELATED TO RESPIRATION - 1. Cough Reflex: Due to stimulation in Trachea before it 2.5 lit. air is inhaled. 2. Sneezing Reflex: Stimulati
What is the function of the umbilical cord? The umbilical cord is a set of blood vessels that connects the fetus with the placenta. In the fetus one extremity of the cord inse
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Q. Which are the glands present in the epidermis of birds, reptiles and mammals? In the epidermis of reptiles and birds there are practically no glands. In mammals there are se
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Thermal Properties The range of temperature variatidn in the aquatic environment is smaller in comparison to air. This means the rate of change of temperature is slower in the
phylum porifera
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a) What is symbiotic nitrogen fixation? b) Name the two protein components required for this process. Define their role.
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